Excel error when protect sheet

When I protect a Sheet:

Worksheet ws = wb.newWorksheet("Resumen");
writeSheet(ws);  //Method that write some data in the sheet
ws.protect("Some pasword");

Then, I can´t open the File:

Error: We found a problem with some content in 'informacion_programa-2.xlsx'. Do you want us to try to recover as much as we can? If you trust the source of this workbook, click Yes.

If I comment the ws.protect line, work great

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dhatim / fastexcel

Excel error when protect sheet #199